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The drive to make more milk has had an unsavory side effect: Cows have become more genetically similar and less fertile. Scientists are trying to recover valuable genetic variation that was lost.

The Senate Intelligence Committee has summoned top executives from Facebook, Twitter and Google to testify on Wednesday about foreign influence campaigns.

Former FEMA Director Michael Brown blames Homeland Security Secretary Michael Chertoff and other top agency officials for the inadequate response to Hurricane Katrina. Brown testified Friday before the Senate Homeland Security Committee.

"The rich are not only getting richer — they are becoming more dangerous." That's according to Wall Street Journal writer Robert Frank, whose new book, The High-Beta Rich, shows how the spending of the top 1 percent has become "the most unstable force in the economy."

A Gallup survey ranks countries based on degree of "social connectedness" people feel with friends, family, neighbors, colleagues, even strangers. We asked Mongolians why they think they top the list.

Japan's governing Liberal Democratic Party replaced two of its top executives as part of a purge related to investigations into alleged political slush funds.

The candidates — three Democrats and one Republican — clashed over issues including the conflict between Israel and Hamas as they faced off in a 90-minute debate in Los Angeles Monday evening.

Idaho is having its worst summer for wildfire smoke in 25 years and has been America's top smoke producer since June. One megafire will likely only stop when snows arrive.

Hong Kong's most prominent pro-democracy paper, Apple Daily, says it is shutting down. Its accounts have been frozen and much of its top leadership has been arrested.

The Department of Treasury announced sanctions against top Russian officials and businesses Friday. NPR's Mary Louise Kelly talks to Ambassador Daniel Fried of the Atlantic Council about the move.